Is the "Other" Dow Predicting a Plunge?

Lately, everyone's been celebrating the multiyear highs that the Dow Jones Industrial Average (INDEX: ^DJI) has recently reached. But there's another part of the Dow that many people never really pay much attention to -- and it's giving investors a much different view of the market right now.

The other DowThe Dow industrials make up the most popular market measure for a very good reason -- they span nearly every sector of the economy. In that sense, the entire "industrials" label is a misnomer, because only a few of the Dow's components are industrial stocks in the traditional sense. With retailers, restaurants, technology stocks, and health-care companies all members of the Dow, the days when the Industrial Average had mostly stalwart stocks of heavy industry are long gone.

But with the Dow Industrials getting nearly all the attention, it's easy to forget that there are actually two other Dow averages out there. In particular, for many, the Dow Jones Transportation Average (INDEX: ^DJT) plays a pivotal role in confirming whether an up move for the market is likely to continue -- or whether a correction, or worse, is in the cards.

Dark clouds on the horizonThere's an old technical indicator known as Dow Theory that says that the Industrials and the Transports should confirm each other's upward movements. So with the Industrials moving to new multiyear highs lately, you'd ideally see the Transports similarly hitting record levels.

But that hasn't been the case. In fact, after peaking nearly a year ago, the Transports are still down more than 6% from their levels of last May. It would take a very strong move for the Transports to move to new highs and confirm the Dow Industrials' rally.

What's with transportation stocks?To understand why the Transports aren't doing as well as the Industrials, it's helpful to drill down into the average itself. The Transports include 20 stocks in four broad categories: airlines, railroads, trucking and shipping, and delivery. Looking at each of those categories and their performance over the past nine months:

Delivery companies UPS (NYSE: UPS) and FedEx have both posted gains, with UPS rising 9%. As the economy has improved, demand for shipments has climbed with it, bolstering prospects for the two major delivery players.

Railroads have had mixed performance. Kansas City Southern tops the gainers list, but CSX (NYSE: CSX) has suffered a substantial loss as lower volumes of coal shipments caused by low natural gas prices have hurt the company's bottom line.

Trucking companies are also a mixed lot, with strength in some players and weakness in others. But Overseas Shipholding Group (NYSE: OSG) has been by far the worst of the bunch, as a glut in both tanker ships and dry-bulk vessels is hurting the entire industry.

While Dow Theory has been around for a long time, its value may have diminished over time. Transportation is definitely a key element of the economy, but it's only one element. More importantly, the impact of energy costs is disproportionately high on the entire industry, with only a few checks and balances within the industry -- railroads tend to do better in high-cost environments, while truckers and air delivery do better when energy is cheap.

Don't panicAll told, you don't need to prepare for an imminent stock market crash just because the Dow Transports aren't likely to hit new highs anytime soon. After such a big run-up in the overall market, a correction would be a natural pause regardless -- even if you think this is just the start of a much longer-term bull market for stocks in general.

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